JPH02227146A - Controlling method of roll gap of mill and its apparatus - Google Patents

Abstract

PURPOSE:To keep a specified gap between rolls to meet a purpose not depending on experiential decision by detecting displacement of the diameter of the rolls by thermal expansion in the circumference peripheries of the rolls and adjusting a gap between the rolls according to the detected values. CONSTITUTION:A roll-gap controlling apparatus 64 comprises a roll position detecting part 100 to detect relative position of one roll to the other, a controlling part 102 to compare the output signal from the detecting part 100 with a predetermined roll-gap and put out an accelerating signal of the difference between both roll-gaps, a roll-gap adjusting part to be operated by the accelerating signal, and a displacement detecting part 99 which is connected to the controlling part 102 and detects the displacement of the diameter of the rolls by thermal expansion. Further, the roll-gap controlling apparatus 64 and an input apparatus 210 to put the conditions for powder products are connected to a central controlling apparatus 200 comprising a memory circuit 202 to memorize the roll-gap for the conditions for powder products and an output circuit 201 to send out the roll-gap value for the conditions for the powder products.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pulverizer used for milling wheat or the like, and particularly to a roll gap adjustment device for a roll pulverizer.

[Conventional technology and its issues]

In the milling process of making flour from wheat, the crushed wheat, etc. (the raw material to be crushed) is fed to a roll crusher and crushed, but instead of being crushed into powder all at once, several roll crushers are used in series. These are then functionally combined using various sorting devices and conveying devices to obtain crushed products such as wheat flour (products crushed to the required degree of fineness). These flour milling factories are equipped with pulverizers of about 200 Tb, and as mentioned above, several roll pulverizers are arranged in series and the gap between the rolls of each pulverizer is adjusted. Adjustment of the roll gap needs to be adjusted each time depending on the type of roll, the type of raw material, the quality of the product, etc. Moreover, manual adjustment requires experience. For example, the noise generated by the crusher during crushing, the visual confirmation of the crushed particles, etc. Needless to say, a great deal of time was spent adjusting the gap between the rolls of each roll crusher.

Furthermore, the rolls of the crusher inevitably undergo thermal expansion due to the heat generated during crushing, and the engravings on these rolls have a large effect on the pulverized particle size, and the gap between the rolls must be adjusted many times during every 10 days.

In order to solve the conventional problems, the present invention provides a constant roll gap that suits the purpose without relying on experience, and a crusher that can be adjusted by anyone without experience by simply inputting the conditions for fine powder products. An object of the present invention is to provide an automatic roll gap adjustment device.

[Means to solve the problem]

In order to achieve the above object, the present invention relates to the other roll of a pulverizer, in which a pair of rolls are provided so as to freely face each other, and the other roll is moved near and far relative to one roll to adjust the degree of grinding.
A roll position detection unit detects the position of one roll relative to the other roll, and the output signal of the position detection unit is compared with a roll gap value set in advance, and the difference between the roll gap value and the roll gap value is output as a drive signal. A control unit, a roll gap adjustment unit operated by the drive signal of the control unit, and a roll gap adjustment unit provided near the circumference of one roll, the other roll, or both rolls to detect displacement of roll diameter due to thermal expansion and connected to the control unit. a roll gap adjustment device equipped with a displacement detection section, an input device for inputting the conditions of the fine powder product, a memory circuit for storing the roll gap value for the condition of the fine powder product, and a roll gap value for the condition of the fine powder product. The problem was solved by connecting the output circuit to a central control unit having an output circuit for outputting the output to the roll gap adjustment section.

(Function) Using the position where the gap between a pair of rolls of the roll crusher is zero as the origin, the position of the other roll at this time is set as zero, and a roll position detection section is provided in relation to the other roll to detect the gap between the rolls using an electrical signal. Output as . In other words, the position of the other roll is defined as the amount of displacement from the origin, and the roll position detection section communicates this amount of displacement to the control section as the roll gap.

On the other hand, the displacement detection section communicates the displacement of the diameter of the roll near the circumference of the operating roll based on the stopped state to the control section by an electric signal. The control section receives signals from the roll position detection section and the displacement detection section, compares the roll gap with a roll gap value set in advance, and communicates the difference as an electric signal to the roll gap adjustment section. The displacement of the roll diameter of the displacement detecting section after starting the crusher is also taken into consideration. The roll gap adjustment section is a device that changes the roll gap by moving one roll closer to the other. The preset roll gap value is set by an output signal of an output circuit of a central control device connected to a roll gap adjustment device constituted by a roll position detection section, a displacement detection section, a control section, and a roll gap adjustment section. Ru. The output signal is an output signal that matches the conditions of the fine powder input from the input device, that is, the quality of the raw material, the quality of the fine powder, etc., and is derived from a memory circuit that stores roll gaps corresponding to various conditions. It is.

[Effects of the Invention] According to the present invention, the influence of thermal expansion of the grinding roll on the pulverized particle size can be recognized as a specific displacement by detecting the displacement of the roll diameter by the displacement detection unit, without relying on intuition and experience. It becomes possible to adjust (correct) the roll gap using a specific method.

Furthermore, according to the present invention, by determining and memorizing the origin of some of the roll gaps (the state where the roll gap is zero) using the roll gap automatic adjustment device of the crusher, the roll gap adjustment of the crusher, which has been done only by experienced operators up until now, is possible. is possible even for inexperienced people. Furthermore, it is possible to adjust the gap to the same size each time, which is difficult even for experienced users.

In other words, the roll gap, which needs to be changed each time depending on various conditions such as product type and product conditions, is stored in a memory circuit and input to the central control unit through the input device. Since the output circuit outputs the roll gap that matches the conditions of the fine powder product to the roll gap adjustment device, the roll gap can always be the same and appropriate regardless of whether the operator is experienced or inexperienced, simply by selecting the conditions for the fine powder product and raw material. Can be done.

Furthermore, since the inter-roll Ry four-joint device is connected to the central control unit, each machine can be adjusted from the central control room, and there is no need to spend a lot of time adjusting the roll gap of each roll crusher. This can be performed even by inexperienced operators.

〔Example〕

First, FIG. 1 shows an example of the process of milling wheat, etc. by boat.

Here, the main components are four pulverizers (m<flour mill) 1°2.3.4 and three sieve sorters 5 and 6.7.

The first crusher 1 is in pneumatic communication with a cyclone 8, which is provided with an air lock valve 9 at its lower part. Further, here, the switching valve 10 can be used to appropriately supply a portion of the pulverized particles to a measuring section (not shown) that determines the degree of pulverization. Furthermore, it is connected to the supply port of the first sieve sorter 5. In this embodiment, the sieve sorter 5 is capable of sorting and separating into three stages depending on particle size, and has a large particle discharge port 12.
Medium particle outlet 13. It has a small particle outlet 14 , a large particle outlet 12 to the supply port of the pulverizer 1 , a medium particle outlet 13 to the supply port of the second pulverizer, and a small particle outlet 14 to the cyclone 15 . Please contact each.

The second crusher 2 is also connected to a cyclone 15 by pneumatic transport, and the cyclone 15 is provided with an air lock valve 16 at its lower part. Further, here, the switching valve 17 can be used to appropriately supply a portion of the pulverized particles to a measuring section (not shown) that determines the degree of pulverization. Furthermore, the second
to the supply port of the sieve sorting machine 6. The sieve sorter 6 can sort and separate particles into three stages depending on particle size, and has a large particle discharge port 19. Medium particle outlet 20. It has a small particle discharge port 21, a large particle discharge port 19 to the supply port of the second crusher 2, a medium particle discharge port 20 to the supply port of the third crusher 3, and a small particle discharge port 21 to the supply port of the third crusher 3. 22 respectively.

The third crusher 3 then communicates pneumatically with a cyclone 23, which is provided with an air lock valve 24 at its lower part. Further, here, the switching valve 25 can be used to appropriately supply a portion of the pulverized particles to a measuring section (not shown) that determines the degree of pulverization. Zara 3rd
The sieve sorter 817 is connected to the supply port. The sieve sorter 7 can sort and separate particles into three stages depending on particle size, and has a large particle discharge port 27. Medium particle outlet 28. It has a small particle outlet 29, a large particle outlet 27 to the supply port of the fourth crusher 4, and a medium particle outlet 28
to the cyclone 30, and the small particle outlet 29 to the cyclone 3.
Contact 1 respectively. The fourth crusher communicates with the Sincron 23 by pneumatic transportation.

The exhaust air from cyclone 8.15.24 is connected to cyclone 33 via blower 32,
The exhaust air from the cyclones 33 and 35 is also connected to the cyclone 35 via the blower 34, and the exhaust from the cyclones 33 and 35 is connected to the bag filter 3.
6 and then released to the outside. Cyclone 22, 30.31
．． 33.35 both have air lock valve 3 at the bottom.
7.38.39.40.41 are provided and connected to the supply ports of powder receiving tanks 42, 43.44 for storing crushed material. The above is the general milling process for wheat, etc.

Next, the crushers 1 to 4 of this process example will be briefly explained based on FIG. 2. The pulverizer shown in FIG. 2 has a pair of rolls 62 and 63 installed in the pulverizing chamber so as to be able to rotate freely in opposition to each other, and the other roll 63 can be moved far and near relative to one roll 62, and 64 is a gap between the rolls. a regulating device and a third
This will be explained in the figure. Reference numeral 71 is a supply hopper provided at the top of the crusher, 72 is a delivery roll provided at the outlet of the hopper 71, and 73 is a control valve. Further, the lower part of the crushing chamber is a discharge gutter 74 for transporting air, and 75 is a main motor that rotationally drives a pair of rolls.

Next, an embodiment of a roll gap adjusting device for a crusher according to the present invention will be described with reference to FIGS. 3, 4, and 5.

A bearing 69 that pivotally supports the rotating shaft 68 of the roll 63 is mounted on a fulcrum shaft 70 fixed to the machine frame, and is rotatable around the supporting ring 70, so that the roll 63 can be adjusted in distance relative to the roll 62. becomes.

On the other hand, an adjustment rod 81 that is threaded and screwed onto the bearing unit 80 is loosely fitted into a protrusion 85 located symmetrically to the bearing portion mounted on the support ring 70, and a receiving blade 82 is attached to one of the rods. The adjusting rod 81 is clamped to the protrusion 85 by the elastic body 83, the nut 84, and the other nut 84. Also arm 88
One end of the shaft 90 is rotatably mounted on the machine frame, and an eccentric cam 89 is fitted to the other end of the shaft 90, which is fitted into the bearing unit 80. Furthermore arm 8
A shaft 66 into which a rotating shaft 67 of a stepping motor 65 is screwed is fitted to the other end of the stepping motor 6.
5 is rotatably mounted on a shaft 60 fixed to the machine frame.

Of the shafts 60.70°90 shown with diagonal lines in Fig. 3, the shaft 60.70 has one end fixed to the machine frame (not shown), and the shaft 90 has a bearing mounted on the machine frame (not shown). (not shown) axis 9
0 is fitted at one end and is rotatable.

Next, the code 86.99 is a non-contact displacement sensor (hereinafter referred to as ゛°
The sensor 86 is held by a support member 87 provided on the machine frame, and is in contact with a protrusion surface 91 for position detection provided on the circumference of the bearing 69. Therefore, it may be held on the support member 87 with an arbitrary gap provided.The rotating shaft 93 fitted to the roll 62 is supported by a bearing 92 fixed to the crusher frame 94, and the roll 62 is rotatable. There is.

The sensor 99 is held by a support member 96 provided on the machine frame 94, and is provided so as to come into contact with the inner circumference of a seven flange portion 95 formed on the outer circumference of the end face of the crushing roll 62. (FIG. 5) In this embodiment, the sensors 86 and 99 are eddy current displacement sensors. However, it goes without saying that the sensor is not limited to this embodiment and there are various other sensors.

In addition, in this embodiment, the roll position detection unit 1001 and the displacement detection unit 97 are composed of non-contact displacement sensors 86 and 99, and are capable of outputting a voltage of displacement of 1/1000 mm, so it is necessary to manage the amount of displacement in μm units. This can greatly contribute to the displacement detection due to roll gap adjustment or thermal engraving. Further, the roll gap adjustment section 101 refers to a series of mechanisms including the stepping motor 65 and up to the fulcrum shaft 70, and the sensor 86 and the stepping motor 65 are each connected to the control section 102. By the way, when the eccentric cam 89 is rotated by the stepping motor 65, adjustment of 1/1000 mm is possible for 10 steps of the stepping motor, although this varies depending on the structure of the mechanism for transmitting the amount of eccentricity.

Note that the roll position detection section 100 and the roll gap adjustment section 101 are respectively provided in both measuring section machine frames so as to pivotally support the left and right sides of the roll 63. The control unit 102 includes a memory circuit 103 for setting and storing the roll gap value, a comparison circuit 104 for comparing the output signal of the sensor 86 and the set value of the memory circuit 103, and a stepping motor based on the difference resulting from the comparison between the comparison circuit 104. 65 is provided. (FIG. 4) The above control section 102, displacement detection section 97, roll position detection section 100, and roll gap adjustment section 101 constitute a roll gap adjustment device @64.

Next, the operation of the roll gap adjustment device 64 will be explained. First, in the initial setting (zero point), when the nut 84 is tightened with the rolls 62 and 63 in contact with each other, the elasticity of the elastic body 83 brings the rolls 62 and 63 into pressure contact. At this time, the sensor 86 is supported by the support member 87 so as to be in contact with the protrusion surface 91 of the bearing 69. With the above, the initial setting is completed and the zero point of the roll position is generated. Further, the initial values of the sensor 86 and the sensor 99 of the displacement detection section 97 at this time are stored in the storage circuit 103 of the control section 102. Here sensor 86
Although the sensor 86 and the protrusion surface 91 are in contact with each other, an arbitrary gap may be provided between the sensor 86 and the protrusion surface 91 in order to prevent damage due to mechanical pressure. Next, the rotation of the main motor 75 causes the roll 6 to
When rotation of the roller 2 and the roll 63 begins, a signal is output from the sensor 86 to the control unit 102. The comparison circuit 104 compares the signal of the sensor 86 with the set value of the memory circuit 103 and the initial value of the sensor 86, and a difference occurs, and the drive circuit 105 outputs a signal to the stepping motor 65, causing the rotating shaft 67 to rotate. As the rotation shaft 67 rotates, the shaft 66 begins to move to the right (or left), the arm 88 swings to the right (or left), and the rotation of the shaft 90 to which the arm 88 is fixed causes the eccentric cam 89 to rotate to the right (or left). do. Eccentric cam 8
With rotation 9, the bearing unit 80 moves to the right (or left)
By moving, the bearing 69 rotates to the right (or left) about the fulcrum shaft 70, and the gap between the rolls 62 and 63 gradually opens (closes). Bearing 6
9 rotates in the right direction from the initial state, the gap between the sensor 86 and the protrusion surface 91 gradually widens, and the sensor 86 outputs this displacement to the comparison circuit 194.

By repeating the above steps, the roll gap between the rolls 62 and 63 is controlled so as to approach the set value in the memory circuit 103.

Next, the opening degree of the control valve 72 of the crusher 1, 2, 3, 4 is adjusted and the raw material is introduced between the rolls 62, 64. When this crushing starts, the temperature of the rolls 62 and 63 due to crushing and friction gradually rises. The rolls 62, 63 begin to expand as the temperature rises.

When considering the temperature rise of the rolls during operation of this crusher, the temperature rise is 20℃ and the diameter of the rolls is 300m.
+a If the outside temperature is 20℃, simply considering the line engraving rate, 300x (20+20) x 11.8x 10'
← 0.1411.8X 10-': This is the line engraving rate of iron, and the expansion is 140 μI, so the influence on the roll gap of the crusher is significant.

Therefore, as shown in FIG. 3, for example, a temperature sensor 110 for measuring the temperature rise of the rolls is provided at an arbitrary position, and communicated with the control section described above, in response to a drive signal to the stepping motor of the roll gap adjustment device. Although it is possible to add temperature correction according to the temperature of the temperature sensor, the present invention operates as follows. If the gap between the sensor 99 before crushing and the inner circumference of the flange portion 95 of the roll 62 is 90, and the gap after change due to expansion is it, then ΔQ=Qt−Ω.

A displacement ΔQ of the roll diameter occurs, and the displacement detection unit 97 detects Q
t to the control unit 102.

The comparison circuit 104 of the control unit compares the gap Q0 before crushing with the gap Qt after the change, confirms that the current roll gap has changed by 2ΔQ from the initial set value, and sends the drive circuit 105 to correct it. The drive circuit 105 outputs a signal to the stepping motor 65.

If the control section 102 is provided with a communication function and communicates with the central control and with a grinding degree measuring device, etc., and adjusts the roll gaps of all the grinders, complete automation becomes possible.

Next, an embodiment according to the present invention will be described in more detail with reference to FIGS. 5 and 7.

In a flour milling process using one set of four crushers 1 to 4, each of which has a different crushing ability, each of the crushers is provided with the above-mentioned roll gap adjustment device 64. In addition, the central control device 200 to which the input bag E12-10 is connected includes:
A determination circuit 203 that determines the conditions of the refined powder from the input device 210 and an output circuit 20 that outputs a signal based on the determination result.
1 and a storage circuit 202 storing an output signal corresponding to the determination result, the signal of the output circuit 201 is
It is connected to each roll gap adjustment device 64.

First, conditions such as the variety of wheat and the quality of the refined product are input using the input device 210. Based on this condition input, the discrimination circuit 203
The memory circuit 2 determines the roll gap of each pulverizer and which pulverizer to use for pulverization or bypass from the previous conditions, and stores preset operating conditions corresponding to the determination.
02, and is connected to each roll gap adjusting device 64 of the crushers 1 to 4 through an output circuit 201. As described above, each roll gap adjustment device W164 adjusts the roll gap while comparing the output signal of the central controller 200 with the signal of the roll position detection section 100. In addition, in this example, 4
Three mills were installed in one flour milling process, but as mentioned above, there are usually about 20 flour mills in one line, and some wheat ingredients may not pass through all 20 mills because they may be coarser. Moreover, the use of strong flour, medium strength flour, single flour, etc. is determined depending on the variety of wheat, and the roll gap of the crusher is uniquely determined according to the variety of wheat and the quality of the refined product and is stored in the central control device. Accordingly, the roll gap adjustment of each crusher can be easily performed by a single operator, even by an inexperienced person.

As described above, according to the present invention, when the roll gap value of the crusher determined empirically or experimentally is input into the central control device, the roll gap adjustment section automatically sets the roll gap to the set value.

As a result, even an inexperienced or inexperienced operator of a roll crusher can maintain a constant roll gap that is consistent with the raw material type and product quality. can be adjusted quickly.

[Brief explanation of the drawing]

Fig. 1 is a flow diagram of the flour milling process according to the present invention, Fig. 2 is a front view with a part of the pulverizer cut open, Fig. 3 is an example of a roll gap adjustment device, and Fig. 4 is a roll gap adjustment diagram. FIG. 5 is a cross-sectional view of one roll showing a displacement sensor provided on one roll; FIG. 6 is a control circuit diagram of the control unit of the adjusting device; FIG. FIG. 7 is a flow diagram of the milling process when connected, and FIG. 7 is a block diagram of the central controller. 1...Crusher, 2...Crusher, 3...Crusher, 4
... crusher, 5... sieve sorter, 6... sieve sorter,
7... Sieve sorter, 8... Cyclone, 9... Air lock valve, 10... Valve, 12... Large particle outlet, 13... Medium particle outlet, 14... ...Small particle outlet, 15...Cyclone, 16...Air lock valve, 17...Valve, 19...Large particle outlet, 20...Medium particle outlet, 21...・Small particle outlet, 22...Cyclone, 23...Cyclone, 24
...Air lock valve, 25...Valve, 27
...Large particle discharge port, 28...Medium particle discharge port, 29.
...Small particle outlet, 30...Cyclone, 32...
Proa, 33...Cyclone, 34...Proa, 3
5...Cyclone, 36...Bag filter 3
7... Air lock valve, 38... Air lock valve, 38... Air lock valve, 39...
・・Air lock valve, 40・・Air lock・
Valve 41...Air lock valve, 42...Tank, 43...Tank, 44...''Tank, 45...
... Solenoid, 46 ... Supply cylinder, 62 ... Roll, 63 ... Roll, 64 ... Roll gap adjustment device,
65...Stepping motor, 66...Axis, 67
...rotating shaft, 68...shaft, 69...bearing, 70...
...Spin shaft, 71... Supply hopper, 72... Feeding roll, 73... Control valve, 74... Discharge gutter, 75...
...Main electric motor, 80...Bearing unit, 81...Rod, 82...Blade receiver, 83...Elastic body, 84...
Nut, 85...Protrusion, 86...Non-contact displacement sensor (sensor), 87...Support, 88...Arm, 89...Eccentric cam, 9o...Shaft, 91...・・・
Position detection protrusion surface (protrusion surface), 92...bearing, 93.
...Rotating axis, 94...Machine frame, 95...7 Lunge, 9
6... Support material, 97... Displacement detection section, 99... Non-contact displacement sensor, 100... Roll position detection section,
101... Roll gap adjustment section, 102... Control section,
103... Memory circuit, 104... Comparison circuit, 105
... Drive circuit, 110 ... Temperature sensor, 200.
...Central control unit, 201...Output circuit, 202...
- Memory circuit, 203...discrimination circuit, 210...input device.

Claims (3)

[Claims] (1) In a roll gap adjustment device for a pulverizer, in which a pair of rolls are freely opposed to each other and the other roll is moved far or near relative to one roll to adjust the degree of grinding, one roll, the other roll, or both rolls are used. 1. A method for automatically adjusting the roll gap of a pulverizer, characterized by detecting displacement of the roll diameter due to thermal expansion near the circumference of the pulverizer, and adjusting the roll gap based on the detected value. (2) In a group of pulverizers in which a pair of rolls are provided so as to freely face each other and the degree of pulverization is adjusted by moving the other roll near or far from one roll, the position of the other roll with respect to the other roll. a roll position detection unit that detects a roll position detection unit, a control unit that compares an output signal of the position detection unit with a preset roll gap value, and outputs a difference between the roll gap value and the roll gap value as a drive signal; A roll gap adjustment section operated by a drive signal, and a displacement detection section provided near the circumference of one roll, the other roll, or both rolls to detect a displacement in roll diameter due to thermal expansion and connected to the control section. a roll gap adjustment device, an input device for inputting the conditions for fine powder products, a memory circuit for storing roll gap values for the conditions for the fine powder products, and an output circuit for outputting the roll gap values for the conditions for the fine powder products. An automatic roll gap adjustment device for a crusher, characterized in that it is connected to a central control device. (3) The automatic roll gap adjustment method and apparatus for a crusher according to claim (1) or (2), wherein a non-contact displacement sensor is used in the displacement detection section or the roll position detection section.